docs: def head(self, limit=25, **fetch_kwargs):
          """
          shortcut to fetch the first few entries from query expression.
          Equivalent to fetch(order_by="KEY", limit=25)
          :param limit:  number of entries
          :param fetch_kwargs: kwargs for fetch
          :return: query result
          """
          return self.fetch(order_by="KEY", limit=limit, **fetch_kwargs)